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Add tests for MountGetters

Administrator requested to merge mount-getter-tests into master

Created by: felixfbecker

Adds generic tests that test invariants of all mount getters. Updates GitHub DOM fixtures to incorporate DOM changes (new tests were failing against old fixtures). I had to add a custom jest-environment to both use latest JSDOM (for el.insertAdjacentElement()) and expose jsdom as a global. This also allowed me to get rid of the MutationObserver polyfill (and the IntersectionObserver wasn't used anymore).

This increases the browser extension test coverage from 36.06% to 41.20% 🎉

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